sandbox: led: use new function to configure default state

Initialize the led with the default state defined in device tree
in board_init and solve issue with test for led default state.

Reviewed-by: Simon Glass <sjg@chromium.org>

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>

board/sandbox/sandbox.c

@@ -6,6 +6,7 @@
 #include <common.h>
 #include <cros_ec.h>
 #include <dm.h>
+#include <led.h>
 #include <os.h>
 #include <asm/test.h>
 #include <asm/u-boot-sandbox.h>
@@ -47,6 +48,14 @@ int dram_init(void)
 	return 0;
 }
 
+int board_init(void)
+{
+	if (IS_ENABLED(CONFIG_LED))
+		led_default_state();
+
+	return 0;
+}
+
 #ifdef CONFIG_BOARD_LATE_INIT
 int board_late_init(void)
 {